Rebound-check shock-absorber.



E. A. TVERDAHL.

REBOUND CHECK SHOCK ABSORBER APPLICATION man rss. 2l. |911.

Patented Aug. 6, 1918 @www wfg@ E. A. IVERDAHL.

REBOUND CHECK SHOCK ABSORBEH.

APPLICATION FILED Fs.2I. 1911.

41,275,177.' l f I v PafentedAug 6,1918.

2 SHEETS-SHEET 2.

Ii-I'IJIv milllllllllllllllllllllIl I Ii III EDWARD A. TVERDAHL, 0F

iran sirenes cierren.'

CHICAGO, ILLINOIS, .ASSIGNR 0F ONE-HALF TO JOSEPH F. DAVIS, 40]? GHICAG,LLNOS. 4

REBOUND-CHECK SHOCK-11350331512..

To all lwhom t may concern:

Be it known that l, EDWARD A. Tvnnnanr., a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in- Rebound-CheckShoclc-Absoibers, of which the following is a specification.

The object of my invention is the provision of effective means for lchecking the rebound of vehicle spring which means is certain inopera-tion, simple in construction and therefore inexpensive tomanufacture', and embodies no parts liable to be rapidly worn or brokenunder the severe stresses to which such devices are subjected inservice.

A further object of my invention is the provision of means forfrictionally retarding the rebound of vehicle springs whereby breakageof the springs is prevented and the vehicle 'is caused to ride smoothlyover'the roughest roads and of means for adjusting the retarding meansto provide for maximum efieiency thereof.

Further objects and advantages of my invention will be apparent as itishbetter understood by reference to the following specification whenread in connection with the l1acrompanying drawing, illustrating thepreierred embodiments thereof, in which- Figure 1 is a viewinpeispective o" the device showing the mode of applying it to avehicle;

Fig. 2 is a detail in elevation partially in section of a portion ot thedevice with parts.

Fig. 3 is a vertical transverse sizmon vthrough the device;

Fig. 4: is a detail in perspective oi? theclutcli;

Fig. 5 is an elevation ot a slightly difierent form of my invention,and` Fig. 6 is a vertical section through the device as illustrated inFig. 5.

Referring to the drawing, 5 denotes a. short shaft having its endsformed with noncircular reduced extensions 6 and threaded portions 7 toreceive a pair of parallel radial arms 8, said. arms having their innerends :lpertured to fit over the reduced' extensions (3. Nuts 9 engagingthe threaded portions 7, with locking washers 10 interposed between thenuts and the outer faces of the arms 8, rigidly secure the latter to theshaft 5.

Specification of Letters .'Patent.

On the shaft 5 is rotatably mounted a hub collar 13 by bolts orothersuitablelfasteners 17 passing therethrough.

The parts thus :tar described constitute one of a pair of relativelymovable members, the other of the pair being two parallel radial arms.18 having enlarged inner ends and spaced to lreceive the parts 111 and15 therebetween. The enlarged inner ends of the APatented Aug. 6, 1918Application filed February 21, 1917. Serial No. 156,211.9

arms 18 are clamped in frictional engage'- v.

ment with the friction niateriall by U-- shaped members 19 embracing theedge portionsthereof. Screws 28 in each' ofthe members 19 permitthelatter to'be secured in position. By tighteningv the screws 28 theenlarged portions of t e arms v18 are and y adjusting the screws thedegreejof friction may be varied as desired.n

The arms 8 are connected in parallelism by a bolt 21 passing through.their outer` ends and for, the saine purpose a bolt 22 is passedthrough `the outer ends of the arms 18. When the device is applied tothe vehicle the two sets of arms diverge from the shaft o. wardly andare secured at their outer' ends to the aXieQ-Blof the vehicle and thearms 18 extendv outwardly and upwardlyand are secured at their'outerends tothe body '24.-l of The arms 8 extend outwardly and down-.

clamped against. the itriction material 15 u the vehicle. The two setsof arms are, there- .t

fore, mounted so that they can swing toward and from each other uponrelative movement of the axle and the vehicle body. A clutch mechanismis provided and is constructed and arranged so that there ma be` a free,unchecked relative movement o the members in one direction while.relative movement in the other direction. is prevented. This clutchconsists of a series of rollers 25 mounted in recesses 26 in the jannnedagainst the inside ol' the lmb and. the latter is clutched to the shaftso that the shat't and the hub turn as one. Relative. H1o,'e,iiieli.tyot' the shalt and the hub in the opposite direction trees the rollers iand disconnects the hub from the shatt.

The, clutch nrchanism is so arranged thatwhen tln vehicle body 2t movesdownward toward the. axle 22) the `hat't 7 and huh 1t slip and hence thedownward swing! ot) the arms 1S not checked as the arms lo. t'ric tionmaterial 17 and the part ltmove bodily with the hub about the shatt.-llowever. when the vehicle body rises on tbe rebound. the clutch couplesthe shat't .5 and the hub 11 together and assuming these parts to bestationary relative to the arms lr; it;

will be seen that the upii ard swingr ot said arms as they tollovi thevehicle body is cheeked by their t'rirtional eim'atementot" the enlargedAinner ends thereof with the parts l5. rl`he springs are pcrmittedto rc-'tnrn the vehicle. body to its normal position relative to thcaxle butthe action is restrained. thus eliminating the disagreeablel joltingexperienced in vehicles which are not: equipped with shock a bsorbers.

` ln Figs. 5 and t3 ot the drawingv l have illuistiated a slightlyvditllerentl 't'orm ot my invention. The, two triction members areindicated at '30 and Iii, respeclivelv. 'the member 250 is fixed on thehub ll. the latter having an outstandiimend tiangre 132 to which saidmember is bolted or otherwise secured as indicated at 55. rl`he memberIll is slidably mounted on the hub Il and has a lining' 3i ottriction4material. Un the huh tl is mountedran adjusting; mit 235. between whichand the outer t'ace ot tln` member lil is held a spring 25o 'which iscoiled around the hub and which holds the t'riction surface ot' theImember 30. 'lhe tension ot' the springr is regulated by means ot' thenut 35 so that the, degree offriction between the members 30 and 31 maybe adjust-ed as desired.

A ring 39 is secured to the rim ot the meinber 3l by means ot' anglepieces 3S and thel ring is provided with an extension forming' an arm 37(,'orresponding;r to the arms 1S in the previously described structure.fr clutch embodying a (Series ot' rollers 25, mounted in recesses 26 inthe periphery ot the shaft 5 and urged toward the tapered ends ot saidrecessesby springs 27, is provided as described in connection with Figs.l to Ll. in elusive, and performs the same function.

The mechanism lasty described operates in the Same manner as the tiretIdescribed mechanism, the only difference being the menne whereby thefrictional engagement between the two relatively swinging members isobtained. i

lt will be apparent that various changes may be made in the form,construction and yarrangement of the part-S without, departing trom tbespirit and .scope ot the invention or sacriticing any ot' its materialadvantages, the t'orm hereinlwtore described being merely a pret'erredembodiment' thereof.

l claim:

i. device ot' the character described comprisingr a pair ot' membersmounted for relative .swinging movement, means 'friclioiiall'v engaging'a relatively large circum- I tereutiall)v disposed sui-tace of one ot'said members` means Vt'or automatically locking said tirst-mentionedmeans to the other of said members upon relative movementot said membersin one direction Vand for rclasincr said tirSt1-mentioned means uponrelative movement ot said members in theopposite direction. and meansembracingr said tirstmentioned means and the member in trictifrmalengagement therewith for adjusting the. degree ot Yt'rict iontllerebetzween.

2. device otL the character described comprising; a shaft, a Iradial armextending from the shai't. a hnbmounted on the shaft, n, frictionelementv carried by tbehub. a radial arln extending in an angulardirection with respect to the tirst-mentioued arm, a pluralit)Y otclamps embracingr the secoml-men tioned arm and said element. screwscarried by said clamps tor adjustably necurim;I the latter in operativeposition. and a clutch connection between the shaft and lmb whereq bythe Aatter is treely movable in one, direc-- tion with respect tn saidsbatt.

il. device ot' the character described comprisingr a shaft. a pair ot'radial arms tixed on the ends et the shaft. a. hnb on the. shatt betweensaid arms,^a clutch connection between thevv hub :ind shat't. saidconnect-ion being tree to slip in one direction, a disk carried by thehub intermediate its ends and having' friction snrt'accs on both sides.a pair ot spaced radial arms having their inner ends in' trictionalengragfeiiienty with said triction surfaces, and means` Vt'ormaintaining said lrictional engagement. i

t. device ot' the, character described comprisimgr a shaft, a pair ofradial arms lixei' n the ends of the shaft. a hub on the, shaft-.betweensaid arms. a clutch connection between the hub and shaft. saidconnection boinc; tree to slip in one direct-ion, :i disk carried by thehub intermediate its ends and ha ving` friction surtaces on both sideS,a pair of spaced radial armshaving their inner .ends in t'rictionalcontact with said friction snrt'ace` and means embracing said inner endst'or maintaining'and varying said frictionnl contact.

5. A device of tbc character ldescribed comprising' a pair ot membersmounted for :1 relative swinging movement, an elementr carried by oneot' the members and having lEl t'rictional engagement with the other member, a clutch connection bet-Ween the tirst3- mentioned member and theelement carried thereby, said connection being made upon clampsembracing said element and the relative movement of Saud members 1n onemember frictionally engaged therewith. direction and broken uponrelative movey T n r 4 AR i ERDAHL. ment of sind members 1n the oppositednec- DNV D il lV tion, and means for varying the friction be-Wltnesses:

tween said element and the member engag- WM. O. BELT, ring therewith,comprising a plurality of M. A. KIDDIE.

